We're not going to rewrite this code until we can also share the rewrite
with QPpdPrintDevice, which can only happen once we drop support for
RHEL 6, which still ships CUPS 1.4.
Until then, silence these deprecation warnings so that they don't add
noise to other potential build warnings/issues. This matches the
approach taken by Chromium in crbug.com/622493.
Task-number: QTBUG-56545
Change-Id: Ia308ae1e8064dc046745350b0be3992d02f2b760
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
f1aa2ee512